Built-in refrigerator



FIG. 1 is a front view of a built-in refrigerator according to our new design; and,

FIG. 2 is a perspective view thereof.

The broken lines represent environmental structure or unclaimed portions and do not form a portion of the claimed design.

The dotted lines represent the border between claimed and unclaimed subject matter and do not form a part of the claimed design. 

CLAIM The ornamental design for a built-in refrigerator, as shown and described. 